Upadhyay, A.K.Roy, Samar2019-09-282019-09-282005-06http://krishikosh.egranth.ac.in/handle/1/5810129684The present study was conducted to asses the growth performance of golden mahseer fry under different temperature regime and with different concentrated protein diet. An attempt has also been made to standardize and asses the extreme lethal temperature for survival of mahseer fry. In order to find the extreme lethal temperature limit an experiment was conducted in laboratory condition in glass aquarium maintaining temperature 9, 10, 11, 23, 30, 34, 36 and 370C for 96 hours and it was found that the temperature 90C and below or 370C and above are highly lethal for survival of fry. The assessment of growth performance of mahseer fry was conducted under different rearing temperature maintained at 20.82 ± 2.250C, 25.74 ± 2.790C, 30.86 ± 2.440C and room temperature (11.20 ± 2.840C) administrating the formulated diet of 38.79% protein in indoor condition. The result on basis of weight gain, survivality and SGR revealed that the suitable temperature for mahseer fry growth lies between 20-300C with 250C as optimum. The present study also encompasses the comparative performances of endangered cyprinid, Tor putitora at two geographical locations viz. Bhimtal and Pantnagar having different inhabitant temperature by maintaining 20.9%, 30.86% and 38.74% crude protein levels in diet. The finding of growth in terms of length gain, weight gain, SGR and survivality indicated the excellent performance at 38.74% of crude protein level in the diet. The whole body carcass composition from the experimental fry exhibited increasing levels of protein, lipid and decreasing levels of moisture fed with increasing dietary protein levels. In an attempt to correlate the growth performance of mahseer fry in varying temperature and dietary protein at molecular level, certain key enzymes viz. amylase, protease, GOT, LDH along with total DNA content were evaluated. The amylase and protease activity showed a significantly (P ≤ 0.05) positive relation with increasing temperature from 11 to 300C and total DNA showed positive relation up to 250C. Protease activity and total DNA content also showed positive relation with the increasing dietary protein levels, whereas amylase activity with increasing dietary carbohydrate levels. However GOT and LDH did not exhibited any particular correlation under the varying temperature and different protein regime in the diet.ennullThesis